chore: bump to v1.5.7 - compact sidebar items

Services/ServiceTrackerService.cs

@@ -9,7 +9,7 @@ namespace Disco.Plugins.ServiceTracker.Services
 {
     public class ServiceTrackerService
     {
-        public const string PluginVersion = "1.5.6";
+        public const string PluginVersion = "1.5.7";
 
         /// <summary>
         /// Status values that mean a ticket is closed/done. Checked against the saved StatusOverride